SB20260816407 - Improper control of a resource through its lifetime in Linux kernel can

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-72116)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 5.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper state management in the net/can/bcm.c CAN broadcast manager tx_ops handling when a CAN device is unregistered while cyclic transmission remains active. A local user can trigger device removal conditions for an existing operation to cause a denial of service.

The issue can leave an hrtimer re-arming indefinitely and may allow injection into a later reused ifindex until an explicit TX_SETUP update occurs.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/3b762c0d950383ab7a002686c9136b9aa55d2d70
• https://git.kernel.org/stable/c/60d8a7942f4ed2d975207aaeba1adb576707e53d
• https://git.kernel.org/stable/c/6be3e1fedf03eab36a2c09d755d1171287b2014b
• https://git.kernel.org/stable/c/b31d0933509c5a35c0be5736a2ce8df0d1bf112c
• https://git.kernel.org/stable/c/f749e4564952d60e96930c09f2be99955d07c22e